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https://issues.apache.org/jira/browse/CASSANDRA-14557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17106066#comment-17106066
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Sumanth Pasupuleti commented on CASSANDRA-14557:
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Thanks for the rebase and kicking off CI runs.
I agree, it may be non-intuitive that this feature also applies to system
keyspaces, and not just user keyspaces. Infact, one of the primary reasons why
I felt this feature to be useful is to make sure system_auth keyspace comes up
with an RF of 3, vs the default 1.
As for the discussion, do you suggest starting a new thread in dev list / slack?
Will take a look at the dtests and update the ticket.
Also, I've noted that, its best to change the state to "ready to commit" after
the ticket is reviewed, thanks for the suggestion.
> Consider adding default and required keyspace replication options
> -----------------------------------------------------------------
>
> Key: CASSANDRA-14557
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14557
> Project: Cassandra
> Issue Type: Improvement
> Components: Local/Config
> Reporter: Sumanth Pasupuleti
> Assignee: Sumanth Pasupuleti
> Priority: Low
> Labels: 4.0-feature-freeze-review-requested
> Fix For: 4.x
>
> Attachments: 14557-trunk.patch
>
>
> Ending up with a keyspace of RF=1 is unfortunately pretty easy in C* right
> now - the system_auth table for example is created with RF=1 (to take into
> account single node setups afaict from CASSANDRA-5112), and a user can
> further create a keyspace with RF=1 posing availability and streaming risks
> (e.g. rebuild).
> I propose we add two configuration options in cassandra.yaml:
> # {{default_keyspace_rf}} (default: 1) - If replication factors are not
> specified, use this number.
> # {{required_minimum_keyspace_rf}} (default: unset) - Prevent users from
> creating a keyspace with an RF less than what is configured
> These settings could further be re-used to:
> * Provide defaults for new keyspaces created with SimpleStrategy or
> NetworkTopologyStrategy (CASSANDRA-14303)
> * Make the automatic token [allocation
> algorithm|https://issues.apache.org/jira/browse/CASSANDRA-13701?focusedCommentId=16095662&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16095662]
> interface more intuitive allowing easy use of the new token allocation
> algorithm.
> At the end of the day, if someone really wants to allow RF=1, they simply
> don’t set the setting. For backwards compatibility the default remains 1 and
> C* would create with RF=1, and would default to current behavior of allowing
> any RF on keyspaces.
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